[Alsa-user] read in blocks of 20 ms

[<ac...@cs...>]

Hi,

I want to read audio data in blocks of 20 ms with sampling rate of 8000Hz.
Thus every second I want 160 samples?

How do I do this using alsa APIs. I found the docs very confusing in terms of
. periods
. period-size
. frames
. bytes_per_frame

Could someone please
1. give usage of relevant alsa APIs for the above problem.
2. Explain the terms in ways to how alsa relates to them

Regards
-Anurag